Error preparing HTML-CSS output (preProcess)

Distributivité: 2·(3 ± 4) = 2· 3 ± 2· 4

Got it ! Simplifier: [Math Processing Error]$2(3a+1)+ (4+2b)0,5$ =   [Math Processing Error]$(x-y)(a+b)$ =   [Math Processing Error]$(1+x)(2x-2)$ =   -[Math Processing Error]$a^2+(1-a)(1-a)$ =   [Math Processing Error]$a(a+1)^2$ =